D. Timers Prior to the Async/Await Pattern of C# 5.0
Chapter 19 introduced the use of Task.Delay() when a timer was required. For scenarios prior to .NET 4.5, several timer classes are available, including System.Windows.Forms.Timer, System.Timers.Timer, and System.Threading.Timer.
The development team designed System.Windows.Forms.Timer specifically for use within a rich client user interface. Programmers can drag it onto a form as a nonvisual control and regulate the behavior from within the Properties window. Most importantly, it will always safely fire an event from a thread that can interact with the user interface.
The other two timers are very similar. System.Timers.Timer is a wrapper for System.Threading.Timer, abstracting and layering ...
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